Luana Portz

IMPACTOS NO SISTEMA DE DUNAS: DINÂMICA NATURAL VERSUS INTERFERÊNCIA ANTRÓPICA

A orla de Capao da Canoa, RS, intercala areas de alta densidade ocupacional com areas nao urbanizadas que preservam suas caracteristicas naturais. Neste trabalho, buscou-se analisar o indice de vulnerabilidade das dunas frontais, a partir de levantamentos de campo realizados no inverno e verao, utilizando-se uma lista de parâmetros. A partir da taxacao destes, atribuiu-se um indice de vulnerabilidade para cada perfil. Os valores mais altos coincidiram com as areas mais urbanizadas do municipio, devido a posicao da urbanizacao que reduz a largura dos cordoes de dunas frontais. A superioridade dos valores do indice de vulnerabilidade de inverno ao de verao altera o consenso sobre a interferencia humana como principal vetor de vulnerabilidade. Os fatores que mais contribuiram para a degradacao das dunas frontais foram: a condicao de praia, no inverno, e a pressao de uso, no verao, indicando a alta fragilidade de alguns perfis ao longo da orla.

Occupation of the waterfront and the social and environmental impacts in the city of Cidreira, Rio Grande do Sul, Brasil

Introdução Em todo o globo, a área litorânea tende a apresentar índices de densidade demográfica Revista Brasileira de Geografia Física V. 08 N. 04 (2015) 1028-1040.

Strategies for the Management of the Marine Shoreline in the Orla Araranguá Project (Santa Catarina, Brazil)

The Orla Project is a tool of the Brazilian Coastal Management resultant of joint action between the Environment Ministry and the Planning Ministry. This project articulates the three spheres of the government (federal, state, and municipal) and society. Its actions seek the management of the coastal spaces, approaching the environmental and heritage politics. The construction of a Plan for the Integrated Management of the Coastline occurs through workshops with the development of methodologies of diagnosis construction, classification and formulation of scenarios. The classification of the coastline integrates the strategic planning, which will subsidize the decision making process to reach the desired scenarios. Ararangua municipality started its workshops in October 2014, with lectures and discussions between technicians from the federal and state governments, and coordination by the municipal government. During the project period, a field day and more than 40 workshops were developed, which had the participation of the community and public managers. As a result of the workshops, the coastline was sectored by its landscape, typology (exposed, semi-exposed, and sheltered), and levels of occupation in five sectors (S1 to S5). The project identified 40 problems in the area, some recurrent in all sectors and a few specific of some places. In order to solve these problems, 80 actions and measures with different priorities were defined. From the workshops of the Orla Project, it was possible to identify the need to create rules for the use of Ararangua coastline, thus enabling its conservation and helping its sustainable development.

Dune System Restoration in Osório Municipality (Rio Grande do Sul, Brazil): Good Practices Based on Coastal Management Legislation

Dune Management Plans are useful tools to integrate coastal development, dune conservation and even dune restoration. The environmental legislation of Rio Grande do Sul (South of Brasil) establishes a Permanent Preservation Area of 60-m minimum width that should be protected in the coastal dune systems. This study shows the implementation of a coastal management plan in Osorio Municipality (N of Rio Grande do Sul) for the restoration of the foredune. The analysis of previous evolution (1997–2010) of the dune field showed widths lower than the legal requirement and decreasing in the last years. Then, a dune restoration plan was designed and implemented in 2011. The measures included the planned retreat of the road located back the foredune, channelization of the northern whashout’s mouth with a structure under the foredune, installation of sand fences and control of the pedestrian accesses to the beach by both a pathway and a footbridge. Finally, efficiency of the management plan was assessed by monitoring (2011–2016) the foredune evolution, which permitted to conclude a satisfactory result. Only the foredune sector close to the washout’ mouth did not achieve the expected minimum width, but it can be considered acceptable considering its higher sedimentary dynamics, the inherent difficulties of these structures and the short monitoring period from the implementation of the plan.